Vibrator for concrete work



March 9, 1937. A. w. MALL VIBRATOR FOR CONCRETE WORK Filed. Nov. 30,1934 w .w v V 30 lead will produce a most eflective vibrator, per- RUSSHPatented Mmaiios'l UNITED STATES gm 7194i OFFICE Arthur W. Mall,Chicago, Ill. Application November 30, 1934, Serial No. 755,432

7 Claims. (oi. c s '1) This invention pertains to forming of concrete,and like plastic structures, and more particularly to a novel device forsetting up vibrations in the concrete incident to the placing thereof inthe' 5 forms for building walls, dams, and so forth.

It has been proposedto submerge, or partially submerge, a device havingun-balanced weights I therein for setting up vibrations in the plasticmass to facilitate the correct placing thereof in 10 the form and inclose contact with the walls thereof, and the reinforcing members (whenutilized) In all of these devices, with which I am familiar, the weightsare located at one end of the device, and thus the vibrations do nottend to radiate from the entire length of the tool, but only at thepoint of location of the weights, and the weights tend to shift theshaft out of line.

.It is therefore one of the salient objects of my invention to provideavibrator for concrete and like plastic masses, embodying an elongatedcylindrical vibratory member, including a non-rotatable outer housingrotatably supporting an internal rotatable member extendinglongitudinally of the housing with an un-balanced weight car-' m ned 'bythe member extending the full length thereof. g

. Another important object of my invention is the provisionof the use oflead for the un-balanced or eccentric weight, it being found-thatmitting maximum kick for a minimum weight and diameter.

A further object of my invention is the provision of the use of anelongated mass of high specific gravity, as the vibratory element withinthe device, the construction being such the quantity of metal can be cutdown, which would ordinariLv counter-act the vibratory action of anoff-balanced weight.

40 A further important object of my invention is the provision of novelmeans for placing the lead weight in position in' the revolving element,andfor anchoring the same in place, whereby the revolving part isprevented from bending and rubbingon the outer steel casing, which isplaced in the concrete mass... h

A further object of my invention is the provision of the use of acombination of lead with a steel reinforcing so as to obtain the mosteffective vibrator for a given length, diameter, and

- weight.

A further object of my invention is the pro- 5" vision of a removablewear-end for the tool, so that the same can be replaced as the same ising threaded onthe inner end thereof the head I,

which receives the outerend of the sleeve 8 detachably receives thepenetrating point 9, which may or may not be flexible shaft can I, andthe rotating cork l0 thereof extends into worn incident to the repeateduse of the tool within the concrete A still further object of myinvention is to. provide a vibrator for concrete work, which willpossess a minimum diameter, whereby the same 5 can be readily insertedwithin the concrete between the reinforcing bars thereof having an oil.-balanced lead weight with a minimum of dead counter-acting weightaction. With these and other objects in view, the invention consists inthe novel construction. arrangement, and formation of parts, as will behereinafter more specifically described, claimed,

and illustrated in the accompanying drawing, in which drawin'g:- Y IFigure 1 is a side elevation of myimproved vibrator, with parts thereofbroken away and in section to illustrate structural details.

Figure-2 is a detail transverse section through the rotor, taken' on theline 1-2 of Figure 1, but ona larger scale.

Referring to the drawing in detail, wherein similar reference charactersdesignate corresponding parts throughout the several views, the letter Vgenerally indicates my-improved vibrator, which comprises an elongatedcylindrical housing 5, preferably formed from steel, or similarhardmetal. This-housing 5 includes an intermediate tubular or'sleeve-like section 8, havprovided with fins. This point can be threadedon the sleeve, or otherwise detachably secured in place, as may bepreferred.

The penetrating point is also formed of hard material, and can berenewed as the same becomes worn, incident to the continued placingofthe toolin the concrete masses. The casing of the be readily secured tothe head the tool-and is detachably connected with the rotor II. Theformation of the rotor ll forms one of thesalient features of .myinventiomand 45 includes a cylindrical tube or sleeve I2 formed of hardmetal, such as steel. 'I'hissleeve or tube I2 is of less diameter thanthey casing sleeve 6,

and has firmlyanchored in the ends thereof heads l3 and providedwithaxially'disposed stub .50 shafts or spindles I5 and it. Thesespindles are rotatably supported in anti-friction bearings, such as ballbearing races l1. 'I'helheads l3 and ll of the cylindrical .tube orsleeve l2 can be welded, soldered, or otherwise secured in place. 56

'of the longitudinal axis thereof.

Extending longitudinally .of the rotor is the lead weight l8, and it isto be noted that this weight is disposed entirely at one side of theaxle center of therotor. This lead weight [8 is placed within the rotorin a novel manner, and is firmly anchored in place in a novel manner,with the anchoring means forming a reinforcement for the rotor.

In accordance with my invention I provide a steel reinforcing rib orplate i9, which extends across the tube or sleeve I2 of the rotor, atone side This steel plate, web, or rib can abut the end heads is and i4,and the same is provided with an orifice 2D, the purpose of which willbe later set forth.

A second longitudinally extending reinforcing plate or web M isprovided. This web extends diametrically of the tube l2, and from oneend of the same to the other, and the heads i3 and M.

are adapted to abut up against the ends thereof when the heads areplaced in position. This reinforcing plate 2i engages the centralportion of the plate l9, andthe inner face of the tube l2. Thereinforcing plates l9 and 2| are secured together, and to the innerface: of the sleeve or tube 52, by welding, or by the use of solder 22.

Directly in line with the opening 20 the sleeve or tube i2 is providedwith an opening 23, and the sleeve or tube can be provided with anotheropening 2d at a point spaced from the opening 20.

After the reinforcing plates l9 and 2! have been placed within thesleeve: l2, and the end heads i3 and M have been anchored in place, thelead is introduced into the sleeve between the inner face thereof andthe reinforcing plate 19, in a molten condition. A cone can be placedthrough the opening 23, and above the opening 20, so that the moltenlead can be conveniently poured within the compartment defined by thereinforcing plate 19 and the inner face of the sleeve or tube l2. Theopening 24 in the sleeve or tube constitutes a vent for hot vaporsincident to the pouring of the metal in place. Obviously, the moltenmetal will fill up the entire space between the reinforcing plate I! andthe inner surface of the tube, and the same will closely adhere to theplate and to the tube. The reinforcing plate l9 constitutes an effectivemeans for holding the lead l8 in place, and also constitutes a brace forthe tube or sleeve l2. The provision of the web or plate 2| insures therigidity of this structure.

By disposing the lead weight l8 longitudinally of the rotor, I amenabled to place the entire mass of the weight at one side of the axisof the rotor, and thus all dead or counter-balancing weight iseliminated. This insures a maximum amount of kick throughout the entirelength of the vibrator. Not only am I enabled to obtain a maximum amountof kick throughout the length of the vibrator, but I am enabled toeffectively decrease the diameter of the vibrator, and thus the vibratorcan be effectively used in confined places. By the use of thecombination steel and lead rotor, the bending of the-rotor is prevented,and thus all danger of the rotor contacting with the casing of thevibrator is prevented.

The vibrator can be effectively used with concrete, which wouldordinarily be designated as dry concrete, and the tool is very effectivefor the treating of concrete in situ at points that are inaccessible forordinary placing operation.

While I have stated that my improved tool is adapted to be submerged, orpartially submerged, in the concrete mass, it is to be understood thatgood results can be obtained mm the use thereof by clamping the same tot e sides of the con-. crete mass.

The flexible shaft 8 can be driven from any preferred type of a primemover, such as an electric motor, internal combustion engine, and soforth.

Changes in details may be made without departing from the spirit orscope of my invention, but what I claim as new. is:-

l. A vibrator for concrete work comprising an elongated cylindricalcasing adapted to be totally immersed in the concrete work, an elongatedro tor supported internally of said casing including a cylindricalhollow housing, an elongated weight in said housing extending the fulllength thereof and located entirely at one sideof the axial centerthereof, and a reinforcing plate extending across the housing andanchored thereto and fitted against said weight.

2. A vibrator for concrete work comprising an elongated casing, withinsaid casing, said. rotor including a hollow housing formed of hardmetal, and a lead weight extending longitudinally of the housingdisposed at one side of the longitudinal axis thereof, and meansfor'anchoring the weight in the housing, said anchoring means includingreinforcing plates.

3. A rotor for vibrators comprising an elongated hollow cylindricalhousing of hard metal.

a reinforcing plate arranged internally of the housing extending fromone side thereof to the other and disposed on one side of thelongitudinal axis of the housing defining in conJunction with thehousing a compartment, said reinforcins plate having an opening therein,a second diametrically extending reinforcing plate secured to thehousing and to the first plate, said housing having an opening in linewith the first-mentioned opening, and lead received within saidcompartment, the lead being introduced through said opening in amoltencondition in thecompartment.

4. A rotor for concrete vibrators comprising an elongated sleeve of hardmetal, a reinforcing plate extending across the sleeve and secured tothe inner face thereof and disposed at one side of the longitudinal axisof the housing, said platein conjunction with the sleeve defining acompartment, a second reinforcing plate secured to.

an elongated rotor mounted the inner face of the sleeve of the centralportion I of the first-mentioned plate, the sleeve and thefirst-mentioned plate being provided with openings, heads rigidlysecured to the ends of j the sleeveand abutting the ends of the plates,and a a operatively connected to the core, said rotor including atubular housing or hard metal, and an elongated weight arranged withinthe casing at one side of the longitudinal axis thereof.

6. A vibrator for concrete work comprising an elongated cylindricalcasing adapted to be totally submersed in the concrete work, said casinghaving a shell member internallythreaded at both ends, a flexible drivecasing screw-threadedly secured to one end, a pointed penetrating membersecured to the other end, a pair of bearings, a

rotor in said shell mounted in said bearings, said rotor having atubular member, end closure members engaging said bearings and an offsetlead weight therein, a plate mounted in said tubular member forming aconfined space, said lead weight in said space, said lead adapted to bepoured into said space in a molten state and said plate and tubularmember having aligned openings to permit introduction of said lead.

'7. A vibrator for concrete work comprising an elongated cylindricalcasing adapted to be totally submersed in the concrete work, said casinghaving a shell member internally threaded at both ends, a flexible drivecasing screw-threadedly secured to one end, a pointed penetrating membersecured to the other end, a pair of bearings, a rotor in said shellmounted in said bearings, said rotor having a tubular member, endclosure members engaging said bearings and an offset lead weighttherein. a plate mounted in said tubular member forming a confinedspace, said lead weight in said space, said lead adapted to be pouredinto said space in a molten state,,said plate and tubular member havingaligned openlugs to permit introduction of said lead, and said platehaving a second opening to permit egress of hot vapors during the leadfilling action.

ARTHUR w. MALL.

